WO2017128585A1 - Procédé de protection de contenu de sortie sécurisé avancé et module de réception de condition - Google Patents

Procédé de protection de contenu de sortie sécurisé avancé et module de réception de condition Download PDF

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Publication number
WO2017128585A1
WO2017128585A1 PCT/CN2016/085069 CN2016085069W WO2017128585A1 WO 2017128585 A1 WO2017128585 A1 WO 2017128585A1 CN 2016085069 W CN2016085069 W CN 2016085069W WO 2017128585 A1 WO2017128585 A1 WO 2017128585A1
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WO
WIPO (PCT)
Prior art keywords
host
module
video data
audio
level information
Prior art date
Application number
PCT/CN2016/085069
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English (en)
Chinese (zh)
Inventor
张华森
彭美意
李�诚
Original Assignee
深圳国微技术有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
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Application filed by 深圳国微技术有限公司 filed Critical 深圳国微技术有限公司
Publication of WO2017128585A1 publication Critical patent/WO2017128585A1/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/20—Servers specifically adapted for the distribution of content, e.g. VOD servers; Operations thereof
    • H04N21/25—Management operations performed by the server for facilitating the content distribution or administrating data related to end-users or client devices, e.g. end-user or client device authentication, learning user preferences for recommending movies
    • H04N21/254—Management at additional data server, e.g. shopping server, rights management server
    • H04N21/2541—Rights Management
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F21/00—Security arrangements for protecting computers, components thereof, programs or data against unauthorised activity
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F21/00—Security arrangements for protecting computers, components thereof, programs or data against unauthorised activity
    • G06F21/10—Protecting distributed programs or content, e.g. vending or licensing of copyrighted material ; Digital rights management [DRM]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
    • H04N21/45—Management operations performed by the client for facilitating the reception of or the interaction with the content or administrating data related to the end-user or to the client device itself, e.g. learning user preferences for recommending movies, resolving scheduling conflicts
    • H04N21/462—Content or additional data management, e.g. creating a master electronic program guide from data received from the Internet and a Head-end, controlling the complexity of a video stream by scaling the resolution or bit-rate based on the client capabilities
    • H04N21/4627—Rights management associated to the content
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/80—Generation or processing of content or additional data by content creator independently of the distribution process; Content per se
    • H04N21/83—Generation or processing of protective or descriptive data associated with content; Content structuring
    • H04N21/835—Generation of protective data, e.g. certificates
    • H04N21/8355—Generation of protective data, e.g. certificates involving usage data, e.g. number of copies or viewings allowed

Definitions

  • the present invention relates to the field of broadcast television, and in particular to an advanced secure output content protection method and conditional access module.
  • a conditional receiving module independent of the host is typically used to descramble digital television programs controlled by a conditional access system or a digital rights protection system.
  • the CAM is a conditional receiving module that is connected to the host through a physical interface; receives data from the host, including audio and video data and other control information; decrypts the audio and video data; and transmits the audio and video data and other control information back
  • the host receives data from the broadcast network through the tuner or receives data from the Internet through the network card; transmits the data to the conditional receiving module through a physical interface, and receives data from the conditional receiving module through the physical interface.
  • conditional access module the physical interface adopted by most conditional access modules is PCMCIA, which complies with DVB-CI or CI Plus standards, CI. Plus defines a secondary protection scheme for the PCMCIA conditional access module.
  • the conditional receiving module uses AES to encrypt the TS stream and then output it to the host, but this interface increases the manufacturing cost of the host and increases the product size.
  • conditional receiving modules that use the USB universal serial interface as the physical interface. However, the conditional receiving module decrypts the digital TV and directly transmits it back to the host through the USB.
  • the third party device can easily acquire and distribute the audio and video content to unauthorized users. , low security.
  • the main purpose of the present invention is to provide an advanced and secure output content protection method and conditional receiving module, which can increase protection on the output content and prevent the output content from being stolen.
  • the present invention provides an advanced and secure output content protection method, which is applied to a conditional receiving module, and the method includes:
  • the host sends its own identity identifier
  • the re-encrypted target audio and video data is sent to the host through a preset interface.
  • the method further includes:
  • a corresponding encryption flag is set for the target audio and video data that is encrypted again according to the target key.
  • the decrypting the initial encrypted information to obtain the target audio and video data and the corresponding control information further includes:
  • the target key is a symmetric key.
  • control information is control information of the conditional access system and/or control information of the digital copyright protection system.
  • the preset interface is a USB interface.
  • the invention also provides a conditional receiving module, comprising:
  • An interface communication module configured to receive data from the host through a preset interface, and send the data to a corresponding module according to a category; receive information from the modules and pass the preset
  • the port is sent to the host
  • An identity verification module is configured to generate a random password for digitally signing the identity identifier, send it to the host, receive the host identity from the host, perform verification, and pass the verification result to the decryption module, and the conditional receiving module
  • the self identity is passed to the interface communication module;
  • An audio and video input module configured to receive initial encrypted audio and video data sent by the interface communication module, and send the initial encrypted audio and video data to a decryption module;
  • a security level information processing module configured to receive security level information supported by the host sent by the interface communication module, and send the security level information supported by the host to the parsing module;
  • control information processing module configured to receive control information corresponding to the initially encrypted audio and video data sent by the interface communication module, and send the control information to the parsing module;
  • a key generation module configured to determine, together with the host, a target key of the encrypted audio and video data, and transmit the target key to the encryption module
  • a parsing module configured to parse the security level information supported by the host, send the parsing result to the decryption module, parse the control information corresponding to the initially encrypted audio and video data, and extract the decryption required key and content protection level information, where Decrypting required key and content protection level information is sent to the decryption module;
  • a decryption module configured to determine whether the security level information supported by the host is higher than the content protection level information, and if yes, decrypt the initial encrypted audio and video data according to the control information, to obtain target audio and video data, and Passing the content protection level information to the encryption module;
  • an encryption module configured to determine, according to the content protection level information sent by the decryption module, whether the target audio and video data needs to be re-encrypted, and if necessary, perform the target audio and video data again according to the target audio and video data. Encrypting, and transmitting the re-encrypted target audio and video data to the audio and video output module;
  • an audio and video output module configured to output the received re-encrypted target audio and video data to the interface communication module.
  • control information is control information of the conditional access system and/or control information of the digital copyright protection system.
  • the parsing module comprises:
  • a CAS module configured to parse the conditional access system control information, extract the key and content protection level information required for decryption, and send the decryption required key and content protection level information to the decryption module;
  • the DRM module is configured to parse the digital copyright protection system control information, extract the key and content protection level information required for decryption, and send the decryption required key and content protection level information to the decryption module.
  • the preset interface is a USB interface.
  • the advanced security content protection method and the conditional receiving module receive the host identity sent by the host, verify whether the identity of the host is legal, and if it is legal, send the identity of the identity to the host; Determining, by the host, that the identity identifier of the conditional receiving module is legal, determining, together with the host, a target key of the encrypted audio and video data; receiving the initially encrypted audio and video data sent by the host and the corresponding control information, according to the Decoding the initial encrypted audio and video data to obtain the target audio and video data; acquiring the target audio and video data content protection level information according to the control information, and determining, according to the content protection level information, whether the The target audio and video data is re-encrypted, and if necessary, the target audio and video data is again encrypted according to the target key, and the re-encrypted target audio and video data is sent to the host through a preset interface, which may be decrypted according to the target. After the control information of the target audio and video data is acquired Level
  • FIG. 1 is a flowchart of an embodiment of an output content protection method according to the present invention.
  • FIG. 2 is an architectural diagram of an implementation of an output content protection method according to an embodiment of the present invention.
  • FIG. 3 is a schematic structural diagram of an embodiment of a conditional receiving module according to the present invention.
  • FIG. 4 is still another schematic structural diagram of an embodiment of a conditional access module according to the present invention.
  • FIG. 1 is a flowchart of Embodiment 1 of the output content protection method of the present invention, including:
  • Step S101 Generate a random password for digitally signing the identity identifier, and send it to the main
  • the host sends its own identity to the conditional receiving module.
  • the conditional receiving module checks whether the identity of the host is legal. If it is legal, the conditional receiving module sends its own identity to the host. Otherwise, the conditional receiving module stops processing the encrypted audio and video stream from the host.
  • the host identity and the identity of the conditional receiving module are protected in the form of a digital signature, and the conditional receiving module generates a random password before sending the host identity each time and sends the random password to the host for The host identity and the identity of the conditional access module are digitally signed.
  • Step S102 When it is determined that the host checks that the identity identifier of the conditional receiving module is legal, the host determines a target key of the encrypted audio and video data together with the host;
  • the host checks the identity identifier of the conditional receiving module, and if it is legal, proceeds to the next processing step.
  • the identity identifier is usually issued by a third-party trusting authority and embedded in the device, and can be implemented by using an X509 certificate.
  • the conditional receiving module and the host negotiate to generate an encrypted tone.
  • the key to the video data typically using a symmetric key, may use, for example, the Diffie-Hellman key exchange protocol or other variants.
  • Step S103 Receive initial encrypted audio and video data, corresponding control information, and security level information supported by the host, obtain the target audio and video data content protection level information according to the control information, and determine a security level supported by the host. Whether the information is higher than the content protection level information, and if yes, decrypting the initial encrypted audio and video data according to the control information to obtain target audio and video data;
  • the host sends the encrypted audio and video data to the conditional receiving module, and also sends some other control information related to the conditional receiving system or the digital copyright protection system to the conditional receiving module, and sends the security level information supported by the host host through the trusted channel.
  • the condition receiving module determines whether to decrypt the target audio and video data according to the security level information supported by the host, extracts control information of the conditional receiving system or the digital copyright protection system, and acquires the target audio and video data according to the control information.
  • the content protection level information is used to determine whether the security level information supported by the host is higher than the content protection level information, and if yes, decrypt the initial encrypted audio and video data according to the control information to obtain target audio and video data.
  • Step S104 Determine, according to the content protection level information, whether the target audio and video is needed
  • the data is re-encrypted, and if necessary, the target audio and video data is again encrypted according to the target key;
  • the data protection level information is determined according to the content protection level information of the target audio and video data. If it belongs to high-value data, the audio and video data is re-encrypted using a key negotiated with the host, and the corresponding encryption flag is set.
  • Step S105 Send the re-encrypted target audio and video data to the host through a preset interface.
  • the target audio and video data that is re-encrypted and set with the encryption flag is transmitted back to the host through a preset interface, such as a USB interface.
  • a preset interface such as a USB interface.
  • USB as a physical interface can reduce the hardware components required by the host.
  • the host does not need to implement the PCMCIA communication function. It can reuse the existing USB communication function, reduce the cost of the host, and reduce the size of the conditional receiving module and reduce the cost. User accepted.
  • Other interfaces are also available, including wireless or wired connections.
  • conditional receiving module uses a USB conditional receiving module as an example to provide an unencrypted audio and video stream.
  • the conditional receiving system is configured to encrypt the audio and video stream and conditionally receive the information; the digital copyright protection system is used to encrypt the audio and video stream and add digital copyright information; the front end is used to modulate the encrypted audio and video stream Multiplexing; the streaming server is responsible for transmitting the encrypted audio and video streams to the host; the broadcast network is for transmitting data from the front end; the Internet is for transmitting data from the streaming server; and the host is for receiving audio and video from the broadcast network or the Internet.
  • the data is processed in cooperation with the USB conditional access module; the USB conditional access module is used to decrypt the audio and video data and implement different levels of protection depending on the value of the data.
  • the conditional receiving module re-encrypts the audio and video content before returning it to the host through the USB.
  • the host decrypts the content and outputs it to the display device.
  • Device authentication is performed between the conditional receiving module and the host to prevent unauthorized devices from obtaining content.
  • the conditional access module and the host use the symmetric key agreement protocol to generate the same key.
  • the conditional receiving module and the host periodically refresh the key.
  • the conditional access module protects it at different levels based on the value of the audio and video content.
  • FIG. 3 is a schematic structural diagram of an embodiment of the conditional receiving module of the present invention, including:
  • the interface communication module 101 is configured to receive data from the host through a preset interface, and send the data to the corresponding modules according to the category; receive information from the modules and send the information to the host through the preset interface;
  • the preset interface may be a USB interface, or other interfaces may be used, including a wireless or wired connection.
  • the identity verification module 102 is configured to generate a random password for digitally signing the identity identifier, send it to the host, receive the host identity from the host, perform verification, and pass the verification result to the decryption module to receive the condition.
  • the module's own identity is passed to the interface communication module;
  • the audio and video input module 103 is configured to receive initial encrypted audio and video data sent by the interface communication module, and send the initial encrypted audio and video data to a decryption module;
  • the security level information processing module 104 is configured to receive security level information supported by the host sent by the interface communication module, and send the security level information supported by the host to the parsing module;
  • the control information processing module 105 is configured to receive control information corresponding to the initially encrypted audio and video data sent by the interface communication module, and send the control information to the parsing module;
  • the key generation module 106 is configured to jointly determine, with the host, a target key of the encrypted audio and video data, and deliver the target key to the encryption module;
  • the key generation module can also pass the information required for negotiation to the interface communication module, and periodically refresh the encryption key.
  • the parsing module 107 is configured to parse the security level information supported by the host, send the parsing result to the decryption module, parse the control information corresponding to the initially encrypted audio and video data, and extract the key and content protection level information required for decryption.
  • the key and content protection level information required for decryption are sent to the decryption module;
  • the control information is control information of the conditional access system and/or control information of the digital rights protection system.
  • the parsing module includes:
  • a CAS module configured to parse the conditional access system control information, extract the key and content protection level information required for decryption, and send the decryption required key and content protection level information to the decryption module;
  • CAS Conditional Access System
  • the decryption required key and content protection level information are sent to the decryption module.
  • DRM Digital Right Management, digital copyright protection system, usually applied to the field of streaming services of the Internet, encrypting and authorizing audio and video content.
  • the decryption module 108 is configured to determine whether the security level information supported by the host is higher than the content protection level information, and if yes, decrypt the initial encrypted audio and video data according to the control information to obtain target audio and video data, And transmitting the content protection level information to the encryption module;
  • the encryption module 109 is configured to determine, according to the content protection level information sent by the decryption module, whether the target audio and video data needs to be re-encrypted, and if necessary, the target audio and video data is again according to the target audio and video data. Performing encryption, and transmitting the re-encrypted target audio and video data to the audio and video output module;
  • the audio and video output module 110 is configured to output the received re-encrypted target audio and video data to the interface communication module.
  • FIG. 4 is a schematic structural diagram of a USB conditional receiving module with a preset interface of USB in the embodiment.
  • USB as a physical interface reduces the hardware components required by the host, and the host does not need to implement the PCMCIA communication function, and can reuse the existing
  • the USB communication function reduces the cost of the host, reduces the size of the conditional receiving module, reduces the cost, and is beneficial to the user.
  • the encryption module protects the output content, avoids the illegal device stealing the decrypted content, and the key generation module periodically Refreshing the key increases security.

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  • Engineering & Computer Science (AREA)
  • Computer Security & Cryptography (AREA)
  • Theoretical Computer Science (AREA)
  • Multimedia (AREA)
  • Software Systems (AREA)
  • Databases & Information Systems (AREA)
  • Signal Processing (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • General Physics & Mathematics (AREA)
  • Two-Way Televisions, Distribution Of Moving Picture Or The Like (AREA)
  • Technology Law (AREA)
  • Storage Device Security (AREA)

Abstract

L'invention concerne un procédé de protection de contenu de sortie sécurisé avancé et un module de réception de condition. Le procédé consiste : à recevoir un identificateur d'identité d'hôte envoyé par un hôte; si l'identificateur d'identité d'hôte est légitime, à envoyer l'identificateur d'identité de l'hôte lui-même à l'hôte; à déterminer, conjointement avec l'hôte, une clé cible de données audio/vidéo chiffrées; à recevoir des données audio/vidéo chiffrées initiales envoyées par l'hôte et des informations de commande correspondantes, et à déchiffrer les données audio/vidéo chiffrées initiales selon les informations de commande pour obtenir des données audio/vidéo cibles; à acquérir des informations de niveau de protection de contenu concernant les données audio/vidéo cibles selon les informations de commande, et des informations de niveau de protection de contenu peuvent être acquises selon des informations de commande concernant les données audio/vidéo cibles déchiffrées; à réaliser un rechiffrement sur un contenu de sortie ayant besoin d'être chiffré selon les informations de niveau de protection de contenu, et des informations de niveau de sécurité prises en charge par l'hôte peuvent être obtenues; et à déterminer s'il faut ou non délivrer des données audio/vidéo cibles ayant besoin d'être protégées à l'hôte selon les informations de niveau de sécurité, de telle sorte que le contenu de sortie peut être protégé et empêchant le contenu déchiffré d'être volé par un dispositif illégitime.
PCT/CN2016/085069 2016-01-27 2016-06-07 Procédé de protection de contenu de sortie sécurisé avancé et module de réception de condition WO2017128585A1 (fr)

Applications Claiming Priority (2)

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CN201610055960.7A CN105635759B (zh) 2016-01-27 2016-01-27 一种输出内容保护方法与条件接收模块
CN201610055960.7 2016-01-27

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CN105635759B (zh) * 2016-01-27 2019-05-28 深圳国微技术有限公司 一种输出内容保护方法与条件接收模块
CN106953867B (zh) * 2017-03-29 2020-09-22 深圳Tcl数字技术有限公司 CI Plus证书认证方法、认证装置及电视设备
CN108449563B (zh) * 2018-02-01 2020-07-10 厦门星宸科技有限公司 对音视频加解密的方法及系统
CN112260721B (zh) * 2020-10-21 2022-08-02 深圳创维－Rgb电子有限公司 A-cas通信电路、控制方法及a-cas通信装置
CN114666665B (zh) * 2020-12-23 2023-08-01 深圳Tcl新技术有限公司 一种证书的认证方法、存储介质及电视

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